package com.atguigu.serviceEdu.config;

import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import com.baomidou.mybatisplus.core.injector.ISqlInjector;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.context.annotation.Bean;

/**
 * @author Aug28-tlsjn
 * @date 2020-06-29 Monday 14:14
 */
@SpringBootConfiguration
@MapperScan(basePackages = {"com.atguigu.serviceEdu.mapper"})
public class ApplicationContextConfig {

    /**
     * 逻辑删除的插件
     * @return 逻辑删除插件
     */
    @Bean
    public ISqlInjector sqlInjector() {
        return new DefaultSqlInjector();
    }

    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();

        // 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求  默认false
        // paginationInterceptor.setOverflow(false);

        // 设置最大单页限制数量，默认 500 条，-1 不受限制
        // paginationInterceptor.setLimit(500);

        // 开启 count 的 join 优化,只针对部分 left join
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));

        return paginationInterceptor;
    }
}
